Download Shunt compensation technique for improved Power factor by using

Shunt compensation technique for improved Power factor
by using thyristor switched capacitor in flexible AC
transmission systems
Nowadays the power system is complicated and it’s very difficult to fulfill the required demand with good
power quality. Power electronics based FACTS device are one of the suitable solution for improving
power quality. FACTS devices are divided as Shunt controller and Series controller. Shunt controller
called Static Var Compensator (SVC) are used for power factor correction and to improve voltage profile
while Series controller are used to control power flow or improve transient stability. Among the various
SVCs controller, Thyristor Switched Capacitor (TSC) is proposed in this project because of their
advantages over other SVCs.
Reactive power requirement for the system can be fulfilled by connecting a device with transmission line
which has ability to inject or absorb reactive power to regain reactive power balance in system. One of the
most important reactive power sources is power electronics based FACTS device and it has ability to
control the power flow by adjusting system parameters such as line impedance, phase angle and voltage
magnitude in power system.
TSC is one of shunt connected compensator used to provide rapid and continuous control of reactive
power. TSC has advantages: stepwise control, cheaper device, and no generation of harmonics and hence
no filtering is required. A TSC defined as “A shunt connected, thyristor switched capacitor whose
effective reactance is varied in stepwise manner by full or zero conduction operation of thyristor valve.
BLOCK DIAGRAM:
AC INPUT
INDUCTIVE LOAD
THYRISTOR
555 TIMER
SHUNT CAPACITOR
POWER SUPPLY:
LOAD
ADVANTAGES:
1. Power quality improvement
2. Voltage profile improvement
3. Power factor correction
4. Less active and reactive power loss
5. Improvement in efficiency of power system operation